SmartRadio: added option for adaptive delayed power save
Applies when screen is turned off and Delayed power save option is
enabled. When alarm for delayed power save goes off and there's Adaptive
Delay threshold defined, mobile data traffic that occured between the
time of alarm schedule and alarm execution is analyzed. Power save
switch won't be executed in case average mobile data traffic computed
within given time period exceeds defined threshold and alarm will be
postponed (rescheduled).
Conflicts:
	src/com/ceco/gm2/gravitybox/GravityBoxSettings.java
	src/com/ceco/gm2/gravitybox/ModSmartRadio.java